Added short/long and unsigned types for all int based types

stdlib/string.krak

@@ -19,10 +19,6 @@ fun operator+(first: *char, second: ref string): string {
     return string(first) + second
 }
 
-/*fun operator+<T>(first: *char, second: T): string {*/
-    /*return string(first) + second*/
-/*}*/
-
 fun string(in:*char):string {
     var out.construct(in):string
     return out